For much of the 20th century, the Union of Soviet Socialist Republics (USSR), more commonly known as the Soviet Union, rivaled the United States in political, military, and economic strength.

"The collapse of the Soviet Union in 1991 was one of the most hopeful moments at the end of the 20th century. The Soviet Union fell — thankfully, and forever," said a spokesperson for Ukraine's ...

Russian President Vladimir Putin famously described the Soviet Union’s collapse as the “greatest geopolitical catastrophe of the 20th century.” On Wednesday, he marked Mikhail Gorbachev’s ...

The 20th century led not, ... Outlasting the Soviet Union required a 40-year struggle pervaded by threats of Armageddon. Other aspiring hegemons did dreadful damage before they fell.

I have always felt that Mikhail Gorbachev was one of the greatest heroes of the 20th century (“Mikhail Gorbachev,” Review & Outlook, Aug. 31). Here was a leader who looked at the facts and ...

MOSCOW — Before Mikhail Gorbachev came along, the Soviet Union seemed an immovable superpower in perpetual antagonism to the United States. With a breathtaking series of reforms, Gorbachev ...

Thanks to the Russian scientists who opposed their country’s disastrous whaling expansion and kept its records, we know how many whales were lost in the 20th century.